SMART datagrid v.1 > Classes > GroupRow
The number of child Rows being included.
You can check the number of all descendant rows of this row like child of child rows by descendantCount.
$('#checkChildren').click(function () {
var group = grid.focusedGroupRow();
if (group) {
for (var i = group.count(); i--;) {
group.getChild(i).setChecked(true);
}
}
});